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RE: 6AF4A Useful?

I don't know. As gm increases, I increase the stopper value. My seat of the pants value for the low gm 'X7 triode is 100 ohms. OTOH, the high gm 5842 has 4 grid connections and I advocate 4X 10 Kohm parts arranged in a "cone" on that tube.

A tiny ferrite bead cemented around, but not touching, the grid's socket lug(s) is another anti-parasitic oscillation method. I like that idea on the "upper" triode of a cascode, as that grid should be at AC ground.

Eli D.

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  • RE: 6AF4A Useful? - Eli Duttman 11:59:36 05/18/17 (0)


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